"Angel In Disguise" is a 1940 pop hit from the Warner Bros. movie It All Came True with music by Paul Mann and Stefan Weiß and lyrics by Kim Gannon. It was sung in the movie by Ann Sheridan.
The tune became a staple of the Warner Bros. Looney Tunes shorts, including appearances in 1942's The Wabbit Who Came to Supper, 1943's Yankee Doodle Daffy, and 1948's Back Alley Oproar.
References
Angel in Disguise (1940 song) Wikipedia(Text) CC BY-SA